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HMC346G8
v01.0304
MICROWAVE CORPORATION
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
ATTENUATORS - SMT
9
Typical Applications
Features
The HMC346G8 is ideal for:
Wide Bandwidth: DC - 8 GHz
• Basestation Infrastructure
Low Phase Shift vs. Attenuation
• Fiber Optics & Broadband Telecom
30 dB Attenuation Range
• Microwave Radio & VSAT
8 Lead Hermetic SMT Package
• Military Radios, Radar, & ECM
• Test Instrumentation
General Description
Functional Diagram
The HMC346G8 is an absorptive Voltage Variable Attenuator (VVA) in an 8 lead glass/metal
(hermetic) surface-mount package operating
from DC - 8 GHz. It features an on-chip reference
attenuator for use with an external op-amp to provide simple single voltage attenuation control, 0
to -3V. The device is ideal in designs where an
analog DC control signal must control RF signal
levels over a 30 dB amplitude range. Applications
include AGC circuits and temperature compensation of multiple gain stages in microwave radios
and test instrumentation.
Electrical Specifications, TA = +25° C, 50 ohm system
Parameter
Insertion Loss
Min
DC - 6 GHz
DC - 8 GHz
Attenuation Range
DC - 8 GHz
Return Loss
DC - 8 GHz
Typical
Max
Units
2.0
2.0
3.0
3.5
dB
dB
30
dB
10
dB
tRISE, tFALL (10/90% RF)
tON, tOFF (50% CTL to 10/90% RF)
2
8
ns
ns
Min. Atten.
Atten. >2 dB
+8
-2
dBm
dBm
Min. Atten.
Atten. >2 dB
+25
+10
dBm
dBm
7
Switching Characteristics
Input Power for 0.25 dB Compression (0.5 - 8 GHz)
Input Third Order Intercept (0.5 - 8 GHz)
(Two-tone Input Power = -8 dBm Each Tone)
9 - 62
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
HMC346G8
v01.0304
MICROWAVE CORPORATION
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Relative Attenuation, Control Voltage
GaAs
MMIC
SUB-HARMONICALLY Optimized
PUMPEDforMIXER
17 - 25 GHz
Insertion
Loss
vs. Temperature
4 GHz Operation
0
0
9
-5
-2
-3
+ 25C
- 40C
+ 85C
-4
-10
-15
-20
-25
-30
-35
-5
-40
0
1
2
3
4
5
FREQUENCY
6
7
8
0
1
2
3
4
5
FREQUENCY (GHz)
6
7
8
Relative Attenuation, Control Voltage
Optimized for 8 GHz Operation
Return Loss vs. Attenuation
0
0
-5
ATTENUATION (dB)
RETURN LOSS (dB)
-5
-10
-15
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
-20
-15
-20
-25
-30
-35
-25
-40
0
1
2
3
4
5
6
7
FREQUENCY (GHz)
8
9
0
10
Relative Attenuation vs.
Control Voltage @ 4 GHz
1
2
3
4
5
FREQUENCY (GHz)
6
7
8
Relative Attenuation vs.
Control Voltage @ 8 GHz
0
0
V1 + 25C
V2 + 25C
V1 - 40C
V2 - 40C
V1 + 85C
V2 + 85C
-0.5
-1
CONTROL VOLTAGE (Vdc)
CONTROL VOLTAGE (Vdc)
-10
ATTENUATORS - SMT
ATTENUATION (dB)
INSERTION LOSS (dB)
-1
-1.5
-2
-2.5
-3
V1 + 25C
V2 + 25C
V1 - 40C
V2 - 40 C
V1 + 85C
V2 + 85C
-0.5
-1
-1.5
-2
-2.5
-3
0
5
10
15
20
RELATIVE ATTENUATION (dB)
25
30
0
5
10
15
20
25
30
RELATIVE ATTENUATION (dB)
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
9 - 63
HMC346G8
v01.0304
MICROWAVE CORPORATION
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
GaAs
MMIC
Relative
Phase
Input Third Order
SUB-HARMONICALLY Intercept
PUMPED
17 - 25 GHz
vs.MIXER
Attenuation*
30
5 dB
10 dB
15 dB
20 dB
25 dB
30 dB
RELATIVE PHASE (DEG)
50
40
30
20
10
0
0
1
2
3
4
5
FREQUENCY (GHz)
6
7
0 dB
25
20
10 dB
15
6 dB
10
3 dB
5
0
8
1
2
4
5
6
8
7
8
80
0 dB
50
3 dB
10 dB
40
30
20
0 dB
70
SECOND HARMONIC (dBc)
60
6 dB
10
60
10 dB
50
6 dB
40
30
3 dB
20
0
1
2
3
4
5
6
7
8
0
1
2
FREQUENCY (GHz)
3
4
5
6
FREQUENCY (GHz)
1 dB Compression vs. Attenuation
0.25 dB Compression vs. Attenuation
20
20
0 dB (REF)
5 dB
15
INPUT P1dB (dBm)
15
10
5
0
10
5
0 dB (REF)
5 dB
0
-5
-5
0
1
2
3
4
5
6
FREQUENCY (GHz)
7
8
0
1
2
3
4
5
6
FREQUENCY (GHz)
*Two-tone input power = -8 dBm each tone.
9 - 64
7
Second Harmonic vs. Attenuation
70
INPUT.25dB COMPRESSION (dBm)
3
FREQUENCY (GHz)
Input Second Order
Intercept vs. Attenuation*
SECOND ORDER INTERCEPT POINT (dBm)
ATTENUATORS - SMT
9
THIRD ORDER INTERCEPT POINT (dBm)
60
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
7
8
MICROWAVE CORPORATION
v01.0304
HMC346G8
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Absolute Maximum Ratings
+18 dBm
Control Voltage Range
+1.0 to -5.0 Vdc
Storage Temperature
-65 to +150 °C
Operating Temperature
-40 to +85 °C
9
ATTENUATORS - SMT
RF Input Power
Outline Drawing
NOTES:
1. PACKAGE MATERIAL: ALUMINA LOADED BOROSILICATE GLASS.
2. LEAD, BASE, COVER MATERIAL: KOVAR™ (#7052 CORNING).
3. PLATING: ELECTROLYTIC GOLD 50 MICROINCHES MIN., OVER
ELECTROLYTIC NICKEL 50 MICROINCHES MIN.
4. DIMENSIONS ARE IN INCHES [MILLIMETERS].
5. TOLERANCES: ±.005 [0.13] UNLESS OTHERWISE SPECIFIED.
6. ALL GROUND LEADS AND GROUND PADDLE MUST BE SOLDERED
TO PCB RF GROUND.
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
9 - 65
MICROWAVE CORPORATION
HMC346G8
v01.0304
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Pin Descriptions
Pin Number
ATTENUATORS - SMT
9
Function
Description
1, 8
RF1, RF2
This pin is DC coupled and matched to 50 Ohm. Blocking
capacitors are required if RF line potential is not equal to 0V.
2, 7
GND
This pin must be DC grounded.
3, 6
V2, V1
Control Input (Master).
4
I
Control Input (Slave).
5
O
This pin must have an external 500 Ohm resistor to ground.
Interface Schematic
Single-Line Control Driver
Note:
External op-amp control circuit maintains impedance
match while attenuation is varied. Input control ranges
from 0 Volts (min. attenuation) to -2.5 Volts (max.
attenuation.)
9 - 66
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
MICROWAVE CORPORATION
v01.0304
HMC346G8
GaAs MMIC HERMETIC SMT VOLTAGEVARIABLE ATTENUATOR, DC - 8 GHz
Evaluation PCB
ATTENUATORS - SMT
9
The circuit board used in the final application should be generated with proper RF circuit design techniques. Signal
lines at the RF ports should be 50 ohm impedance and the package ground leads and package bottom should be connected directly to the PCB RF ground plane, similar to that shown above. The evaluation circuit board shown above is
available from Hittite Microwave Corporation upon request.
List of Material
Item
Description
J1 - J2
PC Mount SMA RF Connector
J3 - J7
DC PIN
U1
HMC346G8
PCB*
104093-2 Eval Board
*Circuit Board Material: Rogers 4350
For price, delivery, and to place orders, please contact Hittite Microwave Corporation:
12 Elizabeth Drive, Chelmsford, MA 01824 Phone: 978-250-3343 Fax: 978-250-3373
Order Online at www.hittite.com
9 - 67